A total of 579 participants (526 swimmers, 53 divers) will compete in the 2019 Division III swimming & diving championships. The full list of men's and women's event qualifiers is available here. The schedule of events can be found here.

Entering the 2019 Swimming & Diving Championships, Pomona-Pitzer won both the men's and women's Southern California Intercollegiate Conference (SCIAC) titles, while Claremont-Mudd-Scripps (CMS) placed second on both sides. This is the second straight crown for both Sagehens' men's and women's teams, and the third in four years for the women's program.

Several SCIAC swimmers and divers will be in action during the four-day national championship. Here they are by team: